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Thermal crosslinking of organic semiconducting polythiophene improves transverse hole conductivity

Appl. Phys. Lett. 95, 173307 (2009); doi:10.1063/1.3254685

Published 30 October 2009

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Ioana R. Gearba,1 Chang-Yong Nam,1 Ron Pindak,2 and C. T. Black1
1Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA
2National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA
Thermal crosslinking using a suitable radical initiator simultaneously improves electrical conductivity in the semiconducting polymer poly(3-hexylthiophene) and makes the material insoluble. Crosslinked polythiophene shows as much as a fivefold increase in hole conductivity across the film thickness without any shift in spectral light absorption. Grazing incidence x-ray diffraction reveals more in-plane polymer lamellae stacking with only a small decrease in film crystallinity. Improved transverse conductivity increases the performance of model planar solar cells by threefold, from 0.07% to 0.2%. The ability to render polythiophene insoluble without disrupting film structural order enables fabrication pathways to more complex device architectures. ©2009 American Institute of Physics
History: Received 1 June 2009; accepted 20 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/173307/1
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KEYWORDS and PACS

Keywords
PACS
  • 73.61.Ph
    Electrical properties of polymers; organic compounds (thin films)
  • 61.41.+e
    Structure of polymers, elastomers, and plastics
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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